package ooday05;

public class StaticFinalDemo {
    public static void main(String[] args) {
        System.out.println(Loo.PI);//常常通过类名点来访问
        //Loo.PI=3.1415926;//编译错误，常量不能被改变
        System.out.println(Loo.num);
        //1)加载Loo.class到方法区中
        //2)静态变量num一并存储到方法区中
        //3)到方法区中获取num的值并输出
        System.out.println(Loo.COUNT);
        //编译器在编译时会将常量直接替换为具体的数，效率高
        //相当于System.out.println(5);
    }
}
class Loo{
    public static int num=5;
    public static final int COUNT=5;
    public static final double PI=3.14159;
}
